Waveforms are a standard way to store physics data. A single waveform
file exists for each shot and a waveform is an array of data in
that file which is accessed by a waveform name. Subroutine
DW_GET returns the waveform
data, description, units, quality flag, and time base for file or
derived waveforms. DW_GETH
also returns the history comment and allows you to select the version
number. The status code is 0 for success; non-zero values mean an
error. (See $ HELP CMLIB WF_ERRORS.)

WF_STOH writes a waveform
to the file. Anyone writing a waveform should first check with Michael
Bell that the waveform name, description, units, etc., are consistent
with PPL accepted waveform practices. The history comment should
start with the date and the initials of the person creating the
waveform. The rest of the comment is free-form, but should indicate
why and/or what was used to generate the waveform.

Link your program with USR:[LIB]CMLIB/OPT.
Sample code for reading and writing waveforms can be found in
TFTR_EXAMPLES. Also see $ HELP CMLIB DW_GET and
USR:[DOC] WFUSE.DOC.